defence with Mikel Lustig looking particularly vulnerable to the runs of Jordi Alba and Neymar.
Alba was then the provider as his cross from the left found Ivan Rakitic lurking in the box but the Croatian international sent his header bouncing into the turf and over the bar.
Neymar was given space to play a wonderful lofted pass to Messi, who crashed a sublime shot on the half-volley in off the near post.
The hosts tried to respond and had their first shot on target in the 37th minute when Moussa Dembele stung the palms of Marc Andre ter Stegen with a fierce strike.
Only a superb save from Gordon stopped Suarez from adding a second before the break as he blocked a point-blank header from the Uruguayan international with his body.
Celtic lost Scott Sinclair to injury at the break but his replacement James Forrest created Celtic’s best opportunity when he picked out Dembele with a cross but the inform French forward sent a tame header straight to ter Stegen.
It was to prove costly as Barcelona doubled their advantage moments later.
Suarez got on the wrong side of Emilio Izaguirre and the Celtic defender hauled him to the ground to earn a penalty that Messi sent straight down the middle to score his 502nd goal for the Catalan giants. – AFP
Barcelona’s Lionel Messi (left) has a shot blocked by Celtic’s Emilio Izaguirre yesterday. –